Kit
8.5#8 in email marketing toolsFrom $33 a monthFree planiOSWebAPI
VisitKit vs Letterhead
Letterhead
5.4#29 in newsletter platformsWebAPI
VisitWhat both publish
| Fact | Kit | Letterhead |
|---|---|---|
| API | Kit offers API access on its Free plan, and its help center describes API V4 for automating workflows and integrating third-party tools. | The platform offers a versioned REST API, webhooks, Zapier, and per-tenant MCP servers. |
| Integrations | Kit has an App Store where community developers publish integrations, installed through API authorization or third-party OAuth flows. | The integrations page lists 30+ products, including Mailchimp, Iterable, Braze, HubSpot, WordPress, Shopify, and Google Ad Manager. |
| Monetization | Kit supports selling digital products and subscriptions, and its site promotes paid newsletters and sponsorships. | Revenue tools manage direct ads, programmatic ads, house promotions, and conversion calls to action across newsletters. |
Kit plans
- NewsletterFree
- Creator$33 a month
- Pro$66 a month
- FreeFree
Letterhead plans
- Letterhead StudioPriced on request
- Letterhead SuitePriced on request
Pick Kit if…
You want what its maker publishes above — check its page for the details.
Pick Letterhead if…
Studio suits newsletter teams that want production and revenue tools while continuing to send through an existing ESP or CRM. Suite is positioned for companies managing many newsletters and audiences that want to grow and convert that audience.